2- When the frequency of the voltage across of a (50HZ) power transformer increased by 10% of the rated value, the no-load current: a) Increased. b) Decreased. c) Remains the same. 3- The self-inductance of an iron-cored coil is a function of: a) The geometry of the coil only. b) The current passing through it only. c) The frequency of the applied voltage only. d) All of the above factors. 4- The most effective factor on the value of the percentage impedance drop of a transformer is: a) The geometry of the coil. b) The rated load currents. c) The number of turms of the winding. 5- The most effective factor on the leakage inductance of an iron-cored coil is: a) The geometry of the coil. b) The current passing through it. c) The frequency of the applied voltage. 6- The iron losses is constant in power transformer because: a) The frequency is constant. b) The flux density is constant. c) The voltage is constant. 7- One of the reasons leads to prefer the core type transformer more than the shell type is: a) Its low leakage reactance. b) It is more robust mechanically. c) It is easy to be repaired. 8- In core design of power transformer the number of steps increased as the cross-sectional area increased to Increase: a) The leakage inductance. b) The cooling oil paths. c) The flux density. 9- The percentage impedance drop is effective character of the transformer because: a) It increases the efficiency. b) It reduces leakage reactance. c) It improves the regulation.
2- When the frequency of the voltage across of a (50HZ) power transformer increased by 10% of the rated value, the no-load current: a) Increased. b) Decreased. c) Remains the same. 3- The self-inductance of an iron-cored coil is a function of: a) The geometry of the coil only. b) The current passing through it only. c) The frequency of the applied voltage only. d) All of the above factors. 4- The most effective factor on the value of the percentage impedance drop of a transformer is: a) The geometry of the coil. b) The rated load currents. c) The number of turms of the winding. 5- The most effective factor on the leakage inductance of an iron-cored coil is: a) The geometry of the coil. b) The current passing through it. c) The frequency of the applied voltage. 6- The iron losses is constant in power transformer because: a) The frequency is constant. b) The flux density is constant. c) The voltage is constant. 7- One of the reasons leads to prefer the core type transformer more than the shell type is: a) Its low leakage reactance. b) It is more robust mechanically. c) It is easy to be repaired. 8- In core design of power transformer the number of steps increased as the cross-sectional area increased to Increase: a) The leakage inductance. b) The cooling oil paths. c) The flux density. 9- The percentage impedance drop is effective character of the transformer because: a) It increases the efficiency. b) It reduces leakage reactance. c) It improves the regulation.
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...
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Transcribed Image Text:2- When the frequency of the voltage across of a (50H2) power transformer increased by 10% of
the rated valuc, the no-load current:
a) Increased.
b) Decreased.
c) Remains the same.
3- The self-inductance of an iron-cored coil is a function of:
a) The geometry of the coil only.
b) The current passing through it only.
c) The frequency of the applied voltage only.
d) All of the above factors.
4- The most effective factor on the value of the percentage impedance drop of a transformer is:
a) The geometry of the coil.
b) The rated load currents.
c) The number of turms of the winding.
5- The most effective factor on the leakage inductance of an iron-cored coil is:
a) The geometry of the coil.
b) The current passing through it.
c) The frequency of the applied voltage.
6- The iron losses is constant in power transformer because:
a) The frequency is constant.
b) The flux density is constant.
c) The voltage is constant.
7- One of the reasons leads to prefer the core type transformer more than the shell type is:
a) Its low leakage reactance.
b) It is more robust mechanically.
c) It is easy to be repaired.
8- In core design of power transformer the number of steps increased as the cross-sectional area
increased to Increase:
a) The leakage inductance.
b) The cooling oil paths.
c) The flux density.
9- The percentage impedance drop is an effective character of the transformer because:
a) It increases the efficiency.
b) It reduces leakage reactance.
c) It improves the regulation.
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